[cfe-dev] Static linking a program
Wink Saville via cfe-dev
cfe-dev at lists.llvm.org
Tue Jun 26 22:58:48 PDT 2018
Thanks everyone, using "clang++ -v -static main.cpp" as a model worked,
see: https://github.com/winksaville/explore-cpp-static-linking
But a curious thing, if I ask to use lld linker it compiles and links
fine, but it
fails with Segmentation fault. What have I done wrong now?
$ clang++ -v -fuse-ld=lld -static main.cpp -o main
clang version 6.0.0 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/8.1.1
Found candidate GCC installation:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1
Found candidate GCC installation: /usr/lib/gcc/x86_64-pc-linux-gnu/8.1.1
Found candidate GCC installation: /usr/lib64/gcc/x86_64-pc-linux-gnu/8.1.1
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
"/usr/bin/clang-6.0" -cc1 -triple x86_64-pc-linux-gnu -emit-obj
-mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name main.cpp -static-define -mrelocation-model pic
-pic-level 2 -pic-is-pie -mthread-model posix -mdisable-fp-elim
-fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables
-fuse-init-array -target-cpu x86-64 -dwarf-column-info
-debugger-tuning=gdb -v -resource-dir /usr/lib/clang/6.0.0
-internal-isystem
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1
-internal-isystem
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/x86_64-pc-linux-gnu
-internal-isystem
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/lib/clang/6.0.0/include -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdeprecated-macro
-fdebug-compilation-dir /home/wink/prgs/explore-cpp-static-linking
-ferror-limit 19 -fmessage-length 121 -stack-protector 2
-fobjc-runtime=gcc -fcxx-exceptions -fexceptions
-fdiagnostics-show-option -fcolor-diagnostics -o /tmp/main-e6f2d0.o -x
c++ main.cpp
clang -cc1 version 6.0.0 based upon LLVM 6.0.0 default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/x86_64-pc-linux-gnu
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../include/c++/8.1.1/backward
/usr/local/include
/usr/lib/clang/6.0.0/include
/usr/include
End of search list.
"/usr/bin/ld.lld" -m elf_x86_64 -static -o main
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crt1.o
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crti.o
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/crtbeginT.o
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64
-L/usr/bin/../lib64 -L/lib/../lib64 -L/usr/lib/../lib64
-L/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../..
-L/usr/bin/../lib -L/lib -L/usr/lib /tmp/main-e6f2d0.o -lstdc++ -lm
--start-group -lgcc -lgcc_eh -lc --end-group
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/crtend.o
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/8.1.1/../../../../lib64/crtn.o
$ ./main 1 2 3
Segmentation fault (core dumped)
$ coredumpctl gdb
PID: 5870 (main)
UID: 1000 (wink)
GID: 100 (users)
Signal: 11 (SEGV)
Timestamp: Tue 2018-06-26 22:40:56 PDT (6s ago)
Command Line: ./main 1 2 3
Executable: /home/wink/prgs/explore-cpp-static-linking/main
Control Group: /user.slice/user-1000.slice/session-c2.scope
Unit: session-c2.scope
Slice: user-1000.slice
Session: c2
Owner UID: 1000 (wink)
Boot ID: 65910f0244bf4b62905c0198842b62d4
Machine ID: 8f80fd742eae4659baed812cd07a9439
Hostname: wink-desktop
Storage:
/var/lib/systemd/coredump/core.main.1000.65910f0244bf4b62905c0198842b62d4.5870.1530078056000000.lz4
Message: Process 5870 (main) of user 1000 dumped core.
Stack trace of thread 5870:
#0 0x0000000000383dc6 n/a
(/home/wink/prgs/explore-cpp-static-linking/main)
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Type "apropos word" to search for commands related to "word"...
Reading symbols from
/home/wink/prgs/explore-cpp-static-linking/main...(no debugging
symbols found)...done.
[New LWP 5870]
Core was generated by `./main 1 2 3'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000000000383dc6 in _dl_get_origin ()
(gdb) bt
#0 0x0000000000383dc6 in _dl_get_origin ()
#1 0x000000000038342f in _dl_non_dynamic_init ()
#2 0x00000000002eecd1 in __libc_init_first ()
#3 0x00000000002ee9c7 in __libc_start_main ()
#4 0x000000000025302a in _start ()
On Tue, Jun 26, 2018 at 2:58 PM, Joerg Sonnenberger via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
> On Tue, Jun 26, 2018 at 09:36:18PM +0000, Shoaib Meenai via cfe-dev wrote:
>> I do see that you're linking all the start files yourself, but the
>> ordering can also make a difference.
>
> crt0.o / crt1.o was missing.
>
> Joerg
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